Click to ENLARGE.
It is sunrise that continues to be tardy.
Notice that sunrise does NOT get earlier following the Solstice!
If anything it continues to get later and later.
It is LATER SUNSETS that are making the daylight longer.
Sunrise does not start getting earlier until January 7, 2018.
Just for the record, compared to the 2016 Solstice, which was also on December 21, we have 3 extra seconds of DAYLIGHT. Wow. Rejoice.